Concrete-mixing drum.



-P.- A. KOEHRING.

CONCRETE MIXING DRUM.

APPLICATION FILED MAR. 16, 1998.

899,415, Patented Sept. 22, 1908.

'W/TNESSYE" I i I INVE/V7'OR .PHILIP A. KOEHRINGpOF MILWAUKEE, WISCONSIN.

CONCRETE-MIXING DRUM.

Specification of Letters Patent.

Patented Sept. 22, 1908.

Application filed March 16, 1908. Serial No. 421,512.

To all whom it may concern: 1

a citizen of the United states, residing at the city of Mi'waukee, county of Milwaukee, and State of Wisconsin, have invented new and usef'ul'lmprovements in Concrete Mixing Drums, of which the following is a specification.

My invention relates toimprovements in concrete mixing drums and it pertains more" especially among other things,-first, to the construction of the heads of the drum having vertical end portions open at their centers,

horizontal cylindrical portions terminating at the periphery of the drum and curved or rounded corner portions formed integrally with said end and cylindrical portions. Second,-to the cylindrical central member interposed between and connected at its respective ends with the cylindrical portions of said heads, and third,-to the construction I and relative arrangement of the series of inclined mixing blades and horizontally arranged buckets, which buckets are interposed between said blades. 4

The object of my invention is not only to simplify the device and reduce the cost of construction, but also to provide a mixer of such a construction that the concrete will not have a tendency to accumulate in the corners between the vertical end and the horizontal cylindrical portions of the drum, but instead will be caused by the rounded or curved shape of the heads to flow toward the center of the drum Whereit will be acted upon by the mixing blades and buckets, whereby the concrete will become more uniformly mixed together.

The construction of my invention is explained by reference to the accompanying drawings-in which,-

Figure 1 represents an endview thereof, and Fig. 2 a longitudinal vertical section, drawn'at right angles to that shown in Fig. 1.

Like parts are identified by the same reference characters in both views.

The respective heads are alike in construction, and they each comprise the verticalcentral portion 1, respectively provided with an opening 2 and 2', horizontal portions 3 and a curved or rounded corner portion 4- by which the vertical and horizontal portions areconnected to ether.

5 represents a orizontal cylindrical memher which is connected at its respective ends v i to the respective heads by the annular se- 1% it known-that I, P 's A. KoEHRiNm,

ries of rivets, 6, 6. Each of the heads is provided with an inwardly diverging collar 7 and an annular series of cog-teeth 8 by which motion is communicated to the drum from the driving gear 9 in the'ordinary manner, while the drum is preferably supportedat its respective sides from the rollers 10.

It will be understood that concrete is conducted to the drum through the opening 2 and discharged through the openin 2 and that the concrete which has been p aced in' the drum is mined as the drum is revolved by the two series of oppositel inclined blades 11 and 12, and SBI'IBS'Of uckets 13 which buckets are interposed between said blades. The blades and buckets are re spectively secured to the inner walls of the drum by a plurality of rivets 14. The relative arrangement of such blades and buckets to each other is such that the concrete which is raised by. the series of blades 11 is discharged into the buckets 13 below the lower end of such blades, while the concrete which is discharged from the buckets 13 will fall upon the blades 12 of the other series and the drum to flow toward the center where it is acted upon as stated by said blades and buckets.

Having thus described my invention what I clainras new and desire to secure by Lettors Patent is,

1. In a concrete mixingdrum, the combination with a cylindrical central member of two heads each comprising a vertical end portion open at its center, an annular flange surrounding said opening, diverging 1nwardly from the exterior, a horizontal annular portion and an intermediate curved portion all formed integrally, means for connecting said integrally formed heads with said central cylindrical member, means for revolublysupporting said drum from its pcriphery and an annular series of mixing blades and buckets fixed to drum.

2. In a concrete mixing drum, the combination of a cylindrical central member, two heads each comprising a vertical end ortion open at its center, a horizontal annu ar port1on and an intermediate curved ortion formed integrally, means for rigid y connecting said central cylindrical member and the inner wall of the heads together, two annular series of mixing blades secured to the inner Walls of the drum, the blades of one series being inclined in the opposite direction to those of the other series, and at an angle to the longitudinal axis of the drum, an annular series of horizontally arranged buckets located between the respective blades of said series and means for rigidly securing said blades and buckets to the inner Walls of said drum, the heads of said drum being adapted by their curved shape to cause the concrete therein to flow towards the center of said drum within the lines described by the circular movement of said blades, said blades and buckets being adapted. as said. drum is revolved. to alternately throw the concrete forwardly and backwardly between said. heads, all substan tially as and for the purpose specified.

In testimony whereof I affix my signature in the presence of two witnesses.

PHILIP A. xonnnme.

Witnesses JAS. B. Enwm, N. F. DOPKE. 

